TI-2026-35553 Aliases CVE-2026-48113 GHSA-24fp-5v3p-rvpw

Chisel: ACL Bypass via Post-Handshake SSH Channel ExtraData Injection

HIGH 70CWE-863Published 2026-08-03 · Updated 2026-08-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

Chisel is a TCP/UDP tunnel, transported over HTTP and secured via SSH. In versions prior to 1.11.5, authenticated clients can bypass --authfile ACL restrictions and tunnel traffic to arbitrary destinations reachable from the server. The ACL is enforced only during the initial handshake against declared remotes, but never on subsequent SSH channels that carry actual traffic. A malicious client can authenticate with a permitted remote, then open channels to any host:port it wants. This issue has been fixed in version 1.11.5.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00387 32nd percentileScored 2026-11-07

Fix Fixed chisel (jpillora): 1.11.5github.com/jpillora/chisel (Go): 1.11.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
jpillora	chisel	before 1.11.5	1.11.5	Patch available	CNA
—	github.com/jpillora/chisel (Go)	before 1.11.5	1.11.5	Patch available	GHSA-24fp-5v3p-rvpw

chisel Vendorjpillora Affected before 1.11.5 Fixed in 1.11.5 Patch available CNA
github.com/jpillora/chisel (Go) Vendor— Affected before 1.11.5 Fixed in 1.11.5 Patch available GHSA-24fp-5v3p-rvpw

Remediation

Fix · CNA chisel (jpillora) Fixed in 1.11.5
Fix · GHSA-24fp-5v3p-rvpw github.com/jpillora/chisel (Go) Fixed in 1.11.5 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-48113
2026-10-03 Alias added: GHSA-24fp-5v3p-rvpw

References

Other 3

TI-2024-29392 Chisel AUTH environment variable not respected in server entrypoint CVSS 3.1HIGH 8.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences